HOISTS 16000 SERVICE/MAINTENANCE MANUAL
5-10
Published 05-09-17, Control # 014-28
Measure the rope’s diameter across the crowns of the
strands so the true diameter is measured as shown in
Figure 5-6
The wire rope must be taken out of service when the
reduction from its nominal diameter is more than 5
percent.
Broken Wires
Thoroughly clean the wire rope so breaks can be seen.
Relax the rope, move it off “pick-up points,” and flex it as
much as possible. Use a sharp awl to pick and probe
between wires and strands, lifting any wire which appears
loose or moves excessively.
See Figure 5-7
for an explanation of lay length.
The wire rope must be taken out of service when it has
the following number of broken wires.
• RUNNING ROPES (working lines) — six randomly
distributed broken wires in one lay length, or three
broken wires in one strand of one lay length
• ROTATION RESISTANT ROPS — two randomly
distributed broken wires in six rope diameters or four
randomly distributed broken wires in thirty rope
diameters
• STANDING ROPES (pendants) — more than two
broken wires in one lay length in sections beyond the
end attachment, or more than one broken wire at the
end attachment (see Figure 5-8
)
• ALL ROPES — one outer wire broken at the point of
contact with the core. The broken wire protrudes or
loops out of the rope structure.
NOTE: United States Steel states “Replacement criteria for
galvanized strand boom suspension pendants are
25 percent of the outer wires fractured, or 10
percent of the total numbers, whichever comes
first.”
FIGURE 5-7
Item Description
1
Lay Length: distance measured along rope in which one
strand makes one complete revolution around core.
2Core
3Strand
4Wire
1
2
4
3
FIGURE 5-8
WARNING
Replace wire rope when more
than one broken wire appears
at point marked by arrow.
Item Description
1 Swaged Socket
2 Wedge Socket
3 Poured Zink Socket
4 Hand Spliced Socket
5 Button Socket
M100654a-e
1
2
3
4
5
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